Flashcards in OB Deck (203)
Term pregnancy is a pregnancy greater than ___ how many weeks?
Pre term labor occurs when?
between week 20 and 37
What do tocolytics do?
stop labor if rupture of mem has not occurred, they are smooth muscle relaxers
3 ex of tocolytics?
mag, nifedipine, indomethacin
5 causes of uteroplacental insufficiency?
smoking, insulin dep diabetes, HTN, drug abuse, alcohol consumption
Blood volume increases by what % during pregnancy?
CO increases by what % in pregnancy?
HR increases up to what % in pregnancy?
Do SV and HR increase?
SVR decreases what % in pregnancy and is the result of what?
10-15% (says 21% too) due to decrease in overall vascular tone (decrease resistance in uteroplacental, pulmonary, renal, and cutaneous vascular beds)
What is another pregnancy induced CV change that is r/t muscle?
Why does dilutional anemia occur in pregnancy?
increase in plasma volume in excess of rbc
Usual Hg during pregnancy?
What offsets the decrease in Hg (2)?
right shift of the oxyhg curve and increase in CO
What is responsible for decreasing DBP and SBP? When does this occur?
SVR, 2nd trimester
At term, blood volume is increased how much?
Total BV at term is what/kg?
When does BV return to normal after pregnancy?
1-2 weeks after delivery
HR and SV increase about how much?
HR 20-30% SV 20-50%
What happens to the cardiac chambers during pregnancy?
When do the cardiac effects during pregnancy start to be seen on echo?
1st and 2nd trimester
Greatest increase in CO in pregnant person is seen when?
in labor and right after delivery
When does CO return to normal after delivery?
2 weeks after delivery
CV changes begin as early as how many weeks pregnant?
Increase in HR begins when and peaks when?
begins 1st trimester and peaks 32 week
Beginning in what week does the CO increase by 40%?
Why does CO increase during uterine contractions?
autotransfusion from contracting uterus to central circulation
Immediately after delivery, CO increases by what % and why?
80%; d/t aortocaval decompression and increase in central volume from the uterus
Why does the heart appear enlarged on xray?
diaphgram displaces heart up and to the left